美国PTS公司（Programmed Test Source,Inc.）是国际知名的高性能频率合成器（频率综合器）的生产商，具有品质可靠、切换迅速、相位噪声低、产品线齐全等特点，是众多知名企业如A.D.，G.E.，Motoroal，Philips，Siemens，Toshiba等的合作伙伴。频率合成器是以一个精确度、稳定度极好的石英晶体震荡器作为基准频率，利用加、减、乘、除等基本运算技术，以获得与石英晶体震荡器同等精确度和稳定度的大量离散频率信号的设备。它广泛应用于通讯设备、雷达、导航、频率时间标准等各个技术领域。例如，在各种精密仪表中，频率合成器能提供高分辨率、低噪声（相位噪声）的信号，以适应各种精密测量的需要。

SPECIFICATIONS (apply to both independently programmable output channels)
Number of channels 2 fully independent output channels
Frequency
Range: 0.100 000 0 to 309.999 999 9 MHz
Resolution: 0.1 Hz
Accuracy same as frequency standard
Control: remote by TTL-level parallel-entry BCD or GPIB (optional)
Switching Time (to within 0.1 radian at new frequency)
100 MHz -10 MHz digit: 20 μseconds
1 MHz digit: 5 μseconds
100 KHz - 0.1 Hz digit: 1 μsecond transient, 2 μsecond delay
Phase-Continuous 100 KHz through 0.1 Hz digits
Switching Range: (~1 MHz bandwidth)
Output Level: +3 to +13 dBm (1V max, 50 Ω)
Flatness: ±0.5 dB
Impedance: 50 Ω
Control: preset and remote by analog voltage
Spurious (at full power output, +13 dBm)
Outputs Discrete: -70 dBc
Harmonics: -30 dBc at full power output,(-40 dBc at lower level)
Phase Noise: -63 dBc (0.5 Hz to 15 KHz) including effects of
internal standard
L (1Hz): 100 Hz/-105 dBc, 1 KHz/ -115 dBc, 10 KHz/ -123 dBc,
100 KHz/ -127 dBc
Noise Floor: -135 dBc/Hz
Frequency Internal: OCXO or TCXO
Standard 3 x 10-9/day 1 x 10-8/day
±1 x 10-8/0 - 50ºC ±1 x 10-6/0 - 50ºC
1 x 10-6/year 2 x 10-6/year
External: 10 MHz, 0.4-2.0 Vrms into 300 Ω;
5 MHz, 0.5-2.0 Vrms into 300 Ω
Aux. Output: 10.000 MHz, 0.4 Vrms into 50 Ω
(Note: internal or external standard required for operation)
General Operating Ambient: 0 - 50°C, 95% R.H.
Power: 110 - 125V, 50 - 400 Hz, 75W (100, 220, 240V optional)
Dimensions: 19 x 5.25 x 18 inches (relay rack or bench cabinet)
Weight: 40 lbs
Optional Phase
Rotation: 0 - 360° in .225° steps

PTS D310 FREQUENCY SYNTHESIZER
• two fully independent channels, each covering
0.1-310 MHz
• + 3 to + 13 dBm output
• low phase noise
• fast switching, 3 - 20μs
• fully programmable, BCD or GPIB
• DDS standard with phase-continuous switching
• low power consumption, high reliability